PECI: Human peroxisomal Delta3, Delta2-enoyl CoA isomerase
PDB Code: 2F6Q
Utilization of fatty acids as energy source is a fundamental process in all mammals and involves the evolutionarily conserved β-oxidation pathway of acyl CoAs, which occurs in mitochondria and peroxisomes. The metabolism of saturated fatty acids requires 4 enzyme activities intrinsic to the β-oxidation pathway. However, the metabolism of ubiquitously occurring unsaturated fatty acids requires auxiliary enzymes in addition to the spiral of β-oxidation enzymes. These auxiliary activities consist of Δ3,5, Δ2,4-dienoyl CoA isomerase, Δ2,4 dienoyl CoA isomerase and Δ3 , Δ2 - enoyl CoA isomerase (PECI). PECI is an essential link for peroxisomal b -oxidation of saturated and unsaturated fatty acids. The enzyme catalyzes the isomerization of cis- or trans configured double bonds from the C3 position of acyl-CoAs to yield the trans-2 double bond configured fatty acyl CoA, which can be directed into the β-oxidation pathway.

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